From: Evan Tang etang@codeweavers.com
It actually contains a -1 if the module has a tls slot and a 0 if it doesn't. Putting tls indices in it breaks initialization of the D runtime if a D dll is loaded into a tls-free exe and gets assigned tls slot 0, as it makes the D runtime think the OS hasn't initialized a tls slot: https://github.com/dlang/dmd/blob/6bf60ea0eb174631ede0074a77d3898d943e0b30/d... --- dlls/ntdll/loader.c | 35 +++++++++++++++++++++-------------- dlls/ntdll/tests/rtl.c | 19 +++++++++++++++++++ 2 files changed, 40 insertions(+), 14 deletions(-)
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c index 895a3f5b138..51e8519abc5 100644 --- a/dlls/ntdll/loader.c +++ b/dlls/ntdll/loader.c @@ -1222,7 +1222,7 @@ static BOOL is_dll_native_subsystem( LDR_DATA_TABLE_ENTRY *mod, const IMAGE_NT_H * Allocate a TLS slot for a newly-loaded module. * The loader_section must be locked while calling this function. */ -static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) +static BOOL alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) { const IMAGE_TLS_DIRECTORY *dir; ULONG i, size; @@ -1230,10 +1230,10 @@ static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) LIST_ENTRY *entry;
if (!(dir = RtlImageDirectoryEntryToData( mod->DllBase, TRUE, IMAGE_DIRECTORY_ENTRY_TLS, &size ))) - return -1; + return FALSE;
size = dir->EndAddressOfRawData - dir->StartAddressOfRawData; - if (!size && !dir->SizeOfZeroFill && !dir->AddressOfCallBacks) return -1; + if (!size && !dir->SizeOfZeroFill && !dir->AddressOfCallBacks) return FALSE;
for (i = 0; i < tls_module_count; i++) { @@ -1255,7 +1255,7 @@ static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) else new_ptr = RtlReAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, tls_dirs, new_count * sizeof(*tls_dirs) ); - if (!new_ptr) return -1; + if (!new_ptr) return FALSE;
/* resize the pointer block in all running threads */ for (entry = tls_links.Flink; entry != &tls_links; entry = entry->Flink) @@ -1264,7 +1264,7 @@ static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) void **old = teb->ThreadLocalStoragePointer; void **new = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, new_count * sizeof(*new));
- if (!new) return -1; + if (!new) return FALSE; if (old) memcpy( new, old, tls_module_count * sizeof(*new) ); teb->ThreadLocalStoragePointer = new; #ifdef __x86_64__ /* macOS-specific hack */ @@ -1296,7 +1296,7 @@ static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod )
*(DWORD *)dir->AddressOfIndex = i; tls_dirs[i] = *dir; - return i; + return TRUE; }
@@ -1308,9 +1308,15 @@ static SHORT alloc_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) */ static void free_tls_slot( LDR_DATA_TABLE_ENTRY *mod ) { - ULONG i = (USHORT)mod->TlsIndex; + const IMAGE_TLS_DIRECTORY *dir; + ULONG i, size; + + if (mod->TlsIndex != -1) + return; + if (!(dir = RtlImageDirectoryEntryToData( mod->DllBase, TRUE, IMAGE_DIRECTORY_ENTRY_TLS, &size ))) + return;
- if (mod->TlsIndex == -1) return; + i = *(ULONG*)dir->AddressOfIndex; assert( i < tls_module_count ); memset( &tls_dirs[i], 0, sizeof(tls_dirs[i]) ); } @@ -1374,7 +1380,8 @@ static NTSTATUS fixup_imports( WINE_MODREF *wm, LPCWSTR load_path ) if (!(wm->ldr.Flags & LDR_DONT_RESOLVE_REFS)) return STATUS_SUCCESS; /* already done */ wm->ldr.Flags &= ~LDR_DONT_RESOLVE_REFS;
- wm->ldr.TlsIndex = alloc_tls_slot( &wm->ldr ); + if (alloc_tls_slot( &wm->ldr )) + wm->ldr.TlsIndex = -1;
if (!(imports = RtlImageDirectoryEntryToData( wm->ldr.DllBase, TRUE, IMAGE_DIRECTORY_ENTRY_IMPORT, &size ))) @@ -1431,7 +1438,7 @@ static WINE_MODREF *alloc_module( HMODULE hModule, const UNICODE_STRING *nt_name wm->ldr.DllBase = hModule; wm->ldr.SizeOfImage = nt->OptionalHeader.SizeOfImage; wm->ldr.Flags = LDR_DONT_RESOLVE_REFS | (builtin ? LDR_WINE_INTERNAL : 0); - wm->ldr.TlsIndex = -1; + wm->ldr.TlsIndex = 0; wm->ldr.LoadCount = 1; wm->CheckSum = nt->OptionalHeader.CheckSum; wm->ldr.TimeDateStamp = nt->FileHeader.TimeDateStamp; @@ -1783,7 +1790,7 @@ NTSTATUS WINAPI LdrDisableThreadCalloutsForDll(HMODULE hModule) RtlEnterCriticalSection( &loader_section );
wm = get_modref( hModule ); - if (!wm || wm->ldr.TlsIndex != -1) + if (!wm || wm->ldr.TlsIndex == -1) ret = STATUS_DLL_NOT_FOUND; else wm->ldr.Flags |= LDR_NO_DLL_CALLS; @@ -3712,7 +3719,7 @@ void WINAPI LdrShutdownThread(void) DLL_THREAD_DETACH, NULL ); }
- if (wm->ldr.TlsIndex != -1) call_tls_callbacks( wm->ldr.DllBase, DLL_THREAD_DETACH ); + if (wm->ldr.TlsIndex == -1) call_tls_callbacks( wm->ldr.DllBase, DLL_THREAD_DETACH );
RtlAcquirePebLock(); if (NtCurrentTeb()->TlsLinks.Flink) RemoveEntryList( &NtCurrentTeb()->TlsLinks ); @@ -4216,7 +4223,7 @@ void WINAPI LdrInitializeThunk( CONTEXT *context, ULONG_PTR unknown2, ULONG_PTR NtTerminateProcess( GetCurrentProcess(), status ); } release_address_space(); - if (wm->ldr.TlsIndex != -1) call_tls_callbacks( wm->ldr.DllBase, DLL_PROCESS_ATTACH ); + if (wm->ldr.TlsIndex == -1) call_tls_callbacks( wm->ldr.DllBase, DLL_PROCESS_ATTACH ); if (wm->ldr.ActivationContext) RtlDeactivateActivationContext( 0, cookie ); process_breakpoint(); } @@ -4225,7 +4232,7 @@ void WINAPI LdrInitializeThunk( CONTEXT *context, ULONG_PTR unknown2, ULONG_PTR if ((status = alloc_thread_tls()) != STATUS_SUCCESS) NtTerminateThread( GetCurrentThread(), status ); thread_attach(); - if (wm->ldr.TlsIndex != -1) call_tls_callbacks( wm->ldr.DllBase, DLL_THREAD_ATTACH ); + if (wm->ldr.TlsIndex == -1) call_tls_callbacks( wm->ldr.DllBase, DLL_THREAD_ATTACH ); }
RtlLeaveCriticalSection( &loader_section ); diff --git a/dlls/ntdll/tests/rtl.c b/dlls/ntdll/tests/rtl.c index 2e0bfb650e4..7ffdc9b9382 100644 --- a/dlls/ntdll/tests/rtl.c +++ b/dlls/ntdll/tests/rtl.c @@ -3730,6 +3730,24 @@ static void test_RtlFirstFreeAce(void) HeapFree(GetProcessHeap(), 0, acl); }
+static void test_TlsIndex(void) +{ + LIST_ENTRY *root = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList; + for (LIST_ENTRY *entry = root->Flink; entry != root; entry = entry->Flink) { + LDR_DATA_TABLE_ENTRY *mod = CONTAINING_RECORD(entry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks); + if (lstrcmpiW(L"ntdll.dll", mod->BaseDllName.Buffer) == 0) { + /* Pick ntdll as a dll that definitely won't have TLS */ + ok(mod->TlsIndex == 0, "ntdll.dll TlsIndex: %d instead of 0\n", mod->TlsIndex); + } else if (mod->DllBase == GetModuleHandleA(NULL)) { + /* mingw gcc doesn't support MSVC-style TLS */ + /* If we do get a way to add tls to this exe, uncomment the following test: */ + /* ok(mod->TlsIndex == -1, "Test exe TlsIndex: %d instead of -1\n", mod->TlsIndex); */ + } else { + ok(mod->TlsIndex == 0 || mod->TlsIndex == -1, "%s TlsIndex: %d\n", debugstr_w(mod->BaseDllName.Buffer), mod->TlsIndex); + } + } +} + START_TEST(rtl) { InitFunctionPtrs(); @@ -3774,4 +3792,5 @@ START_TEST(rtl) test_DbgPrint(); test_RtlDestroyHeap(); test_RtlFirstFreeAce(); + test_TlsIndex(); }